The page here https://letsencrypt.org/howitworks/technology/ says that we can authenticate by provisioning a DNS record, but I can’t figure out how. Is there a plugin that is needed?
not yet implemented AFAIK - it’s public beta for a reason 
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It’s actually implemented on the server side but not enabled yet. See this thread and this thread too.
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Nice, thanks. I can hardly wait to give this a try
A post was split to a new topic: Certbot with standalone fails with “could not connect”